text: //
  //  NSString+JYCategory.h
  //  JYBreakpointDownload
  //
  //  Created by weijingyun on 16/5/20.
  //  Copyright © 2016年 weijingyun. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSString (JYCategory)
  
  - (NSString *)MD5String;
  
  // 仅保留 string 前的字符
  - (NSString *)deleteString:(NSString*)string;
  
  // 仅保留 string 后的字符
  - (NSString *)deleteBeforeString:(NSString*)string;
  
  
  @end
  